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One European engine manufacturer doesn't even supply torque figures for its diesels, instead preferring to concentrate on engine features.

In a planing hull, a rapid torque rise from fast idle and plenty of torque at low rpm are what's needed to make boating more pleasurable and safe, particularly when crossing bars. Lindsay Arndt of Energy Power Systems Australia, the Australian distributor of Cat Marine diesels, agreed with me that torque output is more important than maximum kilowatt or horsepower output when it comes to directly comparing diesels. Caterpillar provides a kilowatt output, brake horsepower output and metric (PS) horsepower output on its engine specs, so buyers know exactly what power they are getting. Unlike the European and Japanese engine manufacturers Caterpillar rates its engines on the traditional horsepower-to-kilowatt system where 1.0hp = 746W, not 736 - which is also the Japanese PS system of power measurement. The C9 weighs 87kg more than Volvo Penta's 7.28lt 74P EDC (now called the TAMD75P EDC) which develops 480hp at 2600rpm and 122kg over Yanmar's 7.4lt 6CXM-GTE2, which has a maximum crankshaft output of 493hp at 2900rpm. In bobtail form the C9's weight of 947kg is 37kg more than the nearest diesel for piston displacement, the 7.8lt Iveco Cursor 500, which develops 493hp at 2600rpm. It develops 503hp at 2500rpm and is rated for 250?1000 hours of operation per year and up to half an hour at wide open throttle (WOT) in every six hours or one hour WOT in every 12.5 hours. This engine was designed for planing hulls around 12m in twin installations (its torque would make a Black Watch 40 really perform) and has a piston displacement of 8.8lt from a 112mm bore and 149mm stroke. Caterpillar's C9 is an extension of a family that now includes the C12, C18, C30 and C32, with the C7 due for release at the 2004 Sanctuary Cove Boat Show.Īs with the C12 and C18, the C9 is a straight six with electronic engine management that enables it to comply with IMO requirements for diesel-engine exhaust emissions, such as NOX and black smoke.